_std/macros/hud.dm 
HUD_ZONE_LENGTH | returns the length of a hud zone, adds 1 because these are coordinates of a cell in a grid, and not a corner of a cell in a grid |
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HUD_ZONE_HEIGHT | returns the height of a hud zone, adds 1 because these are coordinates of a cell in a grid, and not a corner of a cell in a grid |
HUD_ZONE_AREA | returns the area of a hud zone (total amount of 32px x 32px tiles in the hud zone) |
HUD_ZONE_EMPTY | The hudzone still has horizontal space available |
HUD_ZONE_WRAPAROUND | The hudzone wrapped around to a new vertical layer |
HUD_ZONE_FULL | The hudzone is completely full of elements |
Define Details
HUD_ZONE_AREA 
returns the area of a hud zone (total amount of 32px x 32px tiles in the hud zone)
HUD_ZONE_EMPTY 
The hudzone still has horizontal space available
HUD_ZONE_FULL 
The hudzone is completely full of elements
HUD_ZONE_HEIGHT 
returns the height of a hud zone, adds 1 because these are coordinates of a cell in a grid, and not a corner of a cell in a grid
HUD_ZONE_LENGTH 
returns the length of a hud zone, adds 1 because these are coordinates of a cell in a grid, and not a corner of a cell in a grid
HUD_ZONE_WRAPAROUND 
The hudzone wrapped around to a new vertical layer